Erstwhile
Erstwhile adjective - Having been such at some previous time.
Usage example: my erstwhile friend ignored me when I ran into her at the mall
Extinct
Extinct adjective - No longer existing.
Erstwhile and extinct are semantically related. Sometimes you can use "Erstwhile" instead an adjective "Extinct".
Nearby Word: extinction
Mutual synonyms
Cite this Source
Extinct and Erstwhile. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/erstwhile/extinct
Erstwhile & Extinct. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/erstwhile/extinct>.
Extinct or Erstwhile. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/erstwhile/extinct.
Google Ngram Viewer shows how "erstwhile" and "extinct" have occurred on timeline